Pulsator-driven percussive tool.



A. H. GIBSON.

PULSATOR DRIVEN PERCUSSIVE TOOL.

APPLICATION FILED JUNE 17. 1911.

1,142,514. v Patented June 8,1915.

2 SHEETSr-SHEET 1 Wimk'sses: lfliwgntow im /W THE NORRIS PETERS (30., PHOTD-LITHO. WASHINGTON D c A. H. GIB-SO N. PULSATOR DRIVEN PERCUSSIVE TOOL.

APPLICATION FILED JUNE 17, I911.

Patented June 8, 1915.

2 SHEETSSHEET 2.

-LITHO4. WASHINGTON. b. L.

mar ne smrns PATENT oemon.

ARTHUR H. GIBSON, OF EASTON, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RAND COMPANY, OFNEW YORK, N. Y. A CORPORATION NEW JERSEY.

PULSATOR-DRIVEN PERCUSSIVE TOOL.

Application .filed J'une l'i, 1911 Serial N o. 633,05.

To all whom it may concern Be it known that I, ARTHUR H. GIesoN, a subject of the Crown of Great Britain, and resident of Easton, in the county of Northampton and State of Pennsylva'nia,'have 1nvented a new and useful Pulsator-Driven Percussive Tool, of which the following is a specification.

This invention relates to pulsator driven percussive tools.

One object of this invention is to provlde a percussive'tool of the piston hammer type operated by a pulsator through reciprocat: ing columns of air. 7

Another object is to provide such a tool with an air feed.

Another object is to provide a pulsator driven percussive tool with an air feed, means being employed for'connecting the air feed for the tool alternately to the opposite sides of the system.

A practical embodiment of my inventlon is represented in the accompanying drawings, in which Figure 1 represents a pulsator drlven hammer drill in position for use, Fig. 2 is a longitudinal central section through the hammer drill, and Fig. 3 is a view in side elevation of the same.

The pulsator is denoted by 1 and it may be driven from any suitable source, such, for instance, as an electric motor 2. The hammer drill cylinder is denoted by 3 and its hammer piston chamber by 4, within which chamber the piston hammer 5 is fitted to reciprocate The piston hammer extension 6 reciprocates in the front head 7. The drill steel is denoted by 8, which drill steel is supported in a suitableholder 9 secured to the front head 7.

A11 anvil block 10 is interposed between the outer end ofthe piston hammer extension 6 and the inner end of the steel 8, which anvil block is permitted a limited longitudinal movement in a recess 11 in the holder 9.

An air feed of the telescope type is provided for feeding the drill to its work, which air feed is herein shown as having its inner tubular member 12 secured to the back end of the cylinder 3 and its outer tubular member 13 as slidably mounted on the inner member 12.

Communication is established from the front and back ends of the piston hammer Specification of Letters Patent.

Patented June 8, 1915.

chamber 4 to the pulsator 1 throughpassages in hose pipe connections 15 and 16.

A manually operated valve 17 may be provided in one of these passages, in the present instance in the hose pipe connection 15, for controlling the operation of the drill. Communication is established from the air feed alternately from the opposite sides of the pulsator system by providing an auxiliary passage 18 which leads from the interior of the tool piston chamber 4 interme diate its ends to the interior of the air feed. The mouth of this auxiliary passage which opens into the chamber 4: is so arranged that as the piston 5 .is reciprocated the auxiliary passage will be brought into open communication with the chamber upon opposite sides of said piston.

The interior of the inner member 12 is open to the interior of the outer member 13 by means of a passage 19 through the back end of the inner member 12.

A' check valve 20 is located in the auxiliary passage 18, which check valve pre-' vents the return of the air from theair feed to the system and also serves to prevent'the pulsations in the system from affecting the air feed.

The interior of the air feed may be brought into open communication with external atmosphere for releasing the feed as, for instance, by means of a manually operated valve 21, which valve is herein shown as communicating with the auxiliary pas sage 18. V 1

While I have shown this invention in connectionwith ahammer drill, it is evident that it maybe used in its different aspects in connection with percussive tools of different types and hammer tools of different types. I have also described this invention in connection with air pressure operated tools but it is to be understood that it may be used equally well in connection with any kind of fluid pressure suitable for the purpose. It is also evident that various changes might be resorted to in the construction, .form and arrangement of the several parts without departing from the spirit and scope of my invention; hence I do not wish to limit myself strictly to the form herein shown and described, but I What I claim is 1. A percussive tool, its cylinder and piston, a pulsator connected to reciprocate the piston, an air feed for the tool, a passage located in position to alternately open ,the air feed to the opposite sides of the pulsator system and means for automatically preventing the return of air from .the air feed to the system.

-2. A percussive tool, its cylindersand piston, a pulsator connected to reciprocate the piston, an air feed for the'tool, a passage connecting the air feed and cylinder and having its cylinder end located in position to alternately open the air feed to the opposite sides of the piston anda check valve for said passage.

3. A percussive tool, its cylinder and piston, a pulsator connected to reciprocate the piston, an air feed for the tool, a passage located in .positionto alternately open the air feed to the'opposite sides of the pulsator system, 'means for automatically preventing the return of air from the air feed to the system and means for opening the air feed to external atmosphere.

4. A percussive tool, its cylinder and pistoma pulsator connected to reciprocate the piston, an air feed for the tool, a passage connecting the air feed With the cylinder presence of two Witnesses, this tenth day of June, 1911.

ARTHUR GIBSON. Witnesses:

F. 'GEORGE 'BARRY, G. S. SUND REN.

fiegaies of thmpatent-may-be obtainedfor'five cents each, by addressing'the Commissioner of Patents, Washington,'D.-0. 

